Pump-piston and valve



(ModeL) J. R. COLLINS. PUMP PISTON AND VALVE.

No. 478,089. Patented July 5, 1892.

UNIT D STATES PATENT OFFICE.

JOHN R. OOLL INS, OF ROCHESTER, MINNESOTA.

"PUMP-PISTON AND VALVE."

SPECIFICATION forming part of Letters Patent No. 478,089, dated July 5, 1892.

Application filedApril 20, 1891. Serial No. 389,567. (Model) T0 aZZ whom it may concern.-

Be it known that L'JOHN R. COLLINS, of Rochester, in the county of Olmsted and State of Minnesota, have invented a new and usefullmprovementinPump-PistonsandValves, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

My invention relates to improvements in a piston and valve adapted to be used in a pump for raising liquids.

The object of the invention is to provide a device that is inexpensively made, that is not liable to get out of repair, that is strong and durable, and is so constructed as automatically to take up its own wear and to be selfpacking.

In the drawings, Figure 1 is an elevation of my improved piston and valve shown in the position it has when the piston is being raised, a fragment of the pump-cylinder being shown in'central vertical section. Fig. 2 is an elevation of my improved piston and valve, the valve being shown in the position it occupies when the piston descends in the cylinder, a part of the piston being broken away to show interior construction. Fig. 3 is a view of the under side of the valve.

The hollow piston A is reciprocable in the pump-cylinder B. The piston has a conical top part A, to which the piston-rod C is secured rigidly centrally at the apex. The pistou A fits loosely in the cylinder, anda number of apertures D (of which three are shown in the drawings, though a greater or even a less number may be used, if desired) permit the passage of water from below to above the piston as the piston descends in the cylinder. The outer surface of the cone A is smooth and forms a valve-seat for the ring-valve E, which is interiorly cone-shaped to fit the cone A. The valve E is loose in the cylinder B and falls and seats itself tightly on the coneshaped valve-seat A when the piston rises, as shown in Fig. 1, but is raised therefrom .by the buoyancy and force of water as the piston descends in the water, but is held to within a little distance from the piston by the collar F rigid, on the rod 0.

The valve E is divided longitudinally into several parts G, G, andG, (three, as shown in drawings, though two or more might be used,) one of which parts, as G, is advisably tapered from top to bottom on both edges, the contiguous edges of the other parts being correspondingly tapered, so that any wear of the parts is readily taken up by this wedge shaped part G, and the valve is made to seat itself Water-tight on the cone A as the piston is raised in, the cylinder. The longitudinal edges of this tapering piece G are formed in planes at angles laterally to radial planes of the valve, as shown in-Fig. 3, the longitudinal inner parts of these edges projecting under the abutting edges of the parts G and G, so that as the part G in lifting water is forced down to its seat on the cone between the parts G and G by its gravity and the weight of the load on the valve its edges act as wedges on the under sides of the parts G and G to force them outwardly against the encircling wall of the cylinder. The periphery of the valve is smooth and fits movably against the wall of the cylinder, and the valve, being held thereto by the weight of its load of water during the upstroke of the piston and by the outward action of the cone and the wedge-shaped part G,'which forces the parts of the valve together and outwardly radially concurrently as the valve seats itself on and closes the cone, forms, also, a water-tight joint with the cylinder. It will be understood that as the valve seats itself on the cone and against the cylinder at the beginning of the upstroke of the piston the cone and the radially-inclined edges of the part- G will force the parts of the valve outwardly concurrently, and the longitudinal taper of the part G will crowd the parts of the valve together annularly, so as to make the piston and valve water-tight in the cylinder in all directions.

In practical operation as the piston descends in the cylinder water passes the piston through the apertures D and through the valve in the position shown in Fig. 2, and as the piston is raised the valve falls on the cone A, closing the apertures D and packing the piston against the inner surface of the cylinder B, so that the water cannot escape. ownwardly past the piston, but is raised it, to which it is held when the valve is' 'eing E becomes a self-packing valve, expanding automatically to take up wear in the walls of the cylinder, which would not be taken up by the non-expanding rigid piston A.

What I claim as new, and desire to secure by Letters Patent, is a A pump-piston and valve comprisin g a hollow piston provided with a rod and having a tapering or conical upper surface througln which there are apertures for the passage of water, a ring-valve in longitudinal parts loose 1 in the containing cylinder about the pistonrod, which ring-valve has a tapering inner surface fitted and resting on the conical part I 

